Low-pressure boiler



March 10, 1931. F. A. PAGE 1,795,735

LOW PRES SURE BOILER Filed Sept. 4, 1928 3 Sheets-Sheet 1 Jig- 2 Q28 29 v 2s 53 I III! II H ll 1/] H H H II ll H H H lllll gwuewtoz frmkflflgge.

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March 10, 1931.

F. A. PAGE LOW PRESSURE BOILER Filed Sept. 4, 1928 3 Sheets-Sheet 2 H II II H H II H H II u H II u u u 1| gwuwntz #011114 Fb e March 10, 1931. F. A; PAGE 7 1,795,735

L Ow PRESSURE BOILER Filed Sept.'4, 192a ssheets-sheet 5 gnventoz Patented Mar. 10, 1931 FRANK A. PAGE, OF SAN FRANCISCO, CALIFORNIA LOW-PRESSURE BOILER Application filed September 4, 1928. Serial No. 303,734.

This invention relates to a low pressure water tube boiler, and its object is to produce a boiler of considerable capacity which is capable of being made in units that can pass through doorways, into houses, basements etc., where it is desired to use a comparatively large quantity of hot water or low pressure steam, and to produce an apparatus which is of a sufliciently small size to go'through doorways While at the same time it may be indefinitely added to produce a boiler of very large capacity, the several units being secured together, one after another in any desired number.

- An object of the invention is to produce a boiler with comparativelylarge mud drums at the lower ends of the tube, whichmud drums will be connected together horizontally for improving the water circulation therein,

nected to them that they are easily removable without disturbing the boiler. as a whole.

The steam drum is in the present instance,

so shaped as to be capable of receiving tubes from two mud drums, the tubes inclining in opposite directions from the steam drum, whereby a suitable fire space is produced between the two mud drums, the tubes themselves forming an arch over the fire grate of the drawings and bars. I

Another object of the duce a very complete circulating system whereby the boiler tubes will be kept clean and have a strong clrculation at all times. This circulating-system provides that the hottest water from the mud drums shall be delivered through the hottest tubes to the outermost point of the steam drum at the upper ends of those tubes. The water from the outer part of the steam drum will then be delivered to the highest and hottest part of thetmud drums. r

Other objects of the invention will be apparent as the description proceeds.

, An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout the several figures of which there may be modifications.

and which will have the tubes so coninvention is to proopening for the passage of steam at 11.

Figure 1 is a View of the complete boiler with the horizontal drums shown in end elevation, I

Figure 2 is a modification of the boiler wherein it is shown partly in section with the pipes all straight and without having the crook shown inFigure 1, and 2 Figure 3 is a side elevation of the boiler with two of the units assembled end to end, the appearance of the boiler being the same in both cases except that in one event the mud drums are further apart than in the other on account of the bend in the heating pipes, or tubes, and showsthe manner of assembling two or more of the'sections together.

The boiler has two mud drums 1 and 2,

which are segment-like in shape, each having one flat side which has all of the holes for the tubes therein. These mud drums have the water pipes 2' to 7 inclusive connected thereto, and the pipes 8 to 13 inclusive connected thereto on the other side, each drum having substantially the same number of pipes con nected thereto, and said pipes all extend into the top drum on the outer side. All of these pipes are substantially bent near their lower ends and are rolled into the mud drums,'onehalf in one drum, andthe other half in the other drum, while at the upper ends they are similarly rolled into a steam chest or drum 1O e The steam chest or drum 10 has a flanged opening at 11 to permit the steam to-be removed from the apparatus 7 The segment-like mud drums land 2 are connected by a series of tubes 14, which extend horizontally from one mud drum to' another.

The steam drum 10' is circular on the top,

and has four flatplanes 15 to 18 inclusive,

forming a broad W for its bottom. The tubes 2 to 13 inclusive are connected in two sets to the two mud drums 1 and 2 at their lower ends, while they are connected in four sets to the flat W shaped bottom of the steam chest at 15, 16, 17 and 18. The mud drums have manhole plates at 20, 21, while thestearn drum has manhole plates at 22 and 23 and an lOi) The mud drums and steam drums are made with substantially parallel front and back faces, which are connected to the next adj acent mud drum and steam drum of the series by short nipples as indicated at 25 to 32 inclusive. All of the tubes 7 and nipples are rolled into place in the mud drums and steam drums in a manner well known in the art, and when they are to be removed they are simply cut out in the usual manner and the shape of the tubes shown in Figure 1 makes it pos-v sible to very easily remove those tubes from the steam drum after their ends have been out off by simply slipping them longitudinally a short distance, and then turning them slight- 1y, Suitable grate bars indicated at 33 are installed beneath the water tubes and there are the lower bafiie plates 34, 35 to direct the flame around the tubing to give the best heating effect. There are also the upper baffle plates 36, 37 which cause the flames that pass the bafile plates 34, 35 to be directed downwardly and then upwardly to the best effect to heat the outer'tubing of the series.

It will be observed that the circulation of the water is necessarily upwardly in those tubes immediately over the fire, but that as the gases are relatively cool beyond the baffles 36, 37, there will be more or less of a down Wardly directed circulation through the outer tubes of the series, the entire circulation system representing a somewhat flattened figure 8 lying on its side.

In actual practice this boiler is usually built up with a brickwork foundation and brickwork walls around it, but as the brickwork forms no part of the present invention, only the boiler is illustrated.

In the form of the invention shown in Figure 2, the mud drums are indicated at 40, 41, the horizontal water tubes at 42, above which are the rate bars 43. This form or boiler has its mud drums and its steam drums substantially of the same shape as the boiler shown in the other form of the invention, but the water tubes of the series l4, 46; four sets in each series, and the series l5, 47; three sets in each of that series are all straight, and are connected both to the mud drum and to the steam drum as in theother case. he only difiiculty with this lies in the fact that the total width of the resultant boiler for the same quantity of heating surface is slightly greater than in the first case. r

This boiler is provided with the long battle plates 50, 51, and with the shorter battle plates 52, 53 which produce substantially the same effect as the baflle plates used in the other form of the invention. In this case the steam drum has the two manholes 55, 57 and a steam water outlet 56. T he mud drums are provided with the manholes 58, 59.

Having thus described my invention, what a I desire to secure by Letters Patent of the United States is as follows, but modifications may be made in carrying out the invention as shown in'the drawings and in the above particularly described form thereof, within the purview of the annexed claims:

1. A low pressure water tube boiler comprising a steam drum substantially circular at its upper portion and having its bottom formed like a wide W, four sets of water tubes connected to said bottom and extending to two mud drums in two series, and a plurality oi horizontal water tubes connecting the mud drums.

2. A low pressure water tube boiler comprising a steam drum having its upper portion cylindrical, and its lower portion formed like a wide capital W, a plurality of Water tubes connected with said bottom in four separate sets, and oppositely extending in two series, a pair of mud drums oppositely positioned to which said tubes are connected in two series, and a plurality of horizontal water tubes connecting the mud drums at their lower portions.

3. A low pressure water tube boiler com prising a steam drum having its upper portion cylindrical, and its lower portion formed like a wide capital W, a plurality of water tubes connected with said bottom in four separate sets and oppositely inclined in two series, a pair of mud drums oppositely positioned to which said tubes are connected in two series, a plurality of horizontal water tubes connecting the mud drums at their lower portions, a set of grate bars over the lower water tubes, and baflie plates so constructed and arranged as to cause an S shape movement of the hot gases on both sides of the boiler. 7

l. A low pressure boiler of the class described, comprising a steam drum, having its bottom formed in four planes, two of said planes being at right angles to the other two, two mud drums, each of said mud drums having a plane surface, the angle of which corresponds to the angle of two of said planes on the steam drum, water tubes connecting the planes of said steam and mud drums, and Water tubes connecting said mud drums.

5. A low pressure boiler comprising a steam drum having its upper portion cylindrical, and having its lower portion formed of a series of planes at right angles to each other and every other one being parallel, a pair of spaced mud drums connected to a plurality of water tubes, said water tubes 0i each drum being connected to the parallel planes of said steam drum, and horizontal water tubes connecting said mud drums.

In testimony whereof I have hereunto set my hand this 24th day of August, A. D. 1928.

FRANK A. PAGE. 

